<!DOCTYPE html>
<html lang="zh-cn">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>树2</title>
    <link rel="stylesheet" href="./treeview.css" />
  </head>
  <body>
    <div class="tree" id="tree">
      <div class="tree-node">
        <span class="indent"></span>
        <span class="content">A</span>
        <div class="tree-node">
          <span class="indent"></span>
          <span class="content">A</span>
        </div>
      </div>
    </div>
  </body>
</html>
